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Computer Freezes Moments After Boot-up

I start up, see my background, icons, etc. Then 10 seconds after the hourglass disappears, everthing freezes - no response from mouse or keyboard. Mouse and keys will work in safe mode, but not sure what to do there. While in safe mode, pop ups tell me I'm infected with virus. Also, a "brave sentry" shortcut icon has appeared on my desktop. Can anybody help? Thanks.